Solar panel



FIG. 1 is a perspective view of a solar panel showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a first side view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a second side view thereof;

FIG. 6 is a third side view thereof; and,

FIG. 7 is a fourth side view thereof.

The broken lines shown represent unclaimed subject matter and form no part of the claimed design. 

CLAIM The ornamental design for a solar panel, as shown and described. 